Scatter plot with different colours,

I have various audio files in hard disc that are being analyzed individually and the results should be plots. Some audio files come from the same source (musical instruments) and have similar names (first 4 letters are similar). I like plotting similar instruments (with simalar names on the hard disc) with the same colors. How should I create this color array?

Answer 1

[Walter Roberson]

[~, basenames] = fileparts(FileNames);
First4 = cellfun(@(S) S(1:4), basenames, 'uniform', 0);
G = findgroups(First4);
nG = max(G);
colors = YourColormapNameSuchAsJet(nG);

Now for the K'th file, use colors(K,:) as the color entry for scatter purposes.